the deadly floods here in this country. At least 18 people now killed across Utah. And we showed you the moment those cars were swept away by the rushing waters. Three mothers and their children inside the cars carried away. Tonight, ABC's nick watt with a story of two boys who survived. What they did in those crucial moments, the air bag in that car. Oh, no! Oh, no! There's two vehicles! Reporter: In hildale today, they named their dead, killed in these vehicles. Three sisters, Josephine and Naomi Jessop, Della black and nine of their children. Three survived. One says he cut through his airbag, climbed through the window and jumped from the roof. A 6-year-old boy, still missing. 30 miles north, in Zion national park, they're searching for one missing hiker. Six others confirmed dead after a flash flood. Hildale is home to the polygamous sect led by Warren Jeffs, currently serving a life sentence for sex crimes. They're suspicious of outsiders. They live a simple, religious life. It helps us deal with it a little more knowing they were all sweet and innocent. We know they will go straight to heaven. Oh my goodness! Reporter: Virginia black filmed the tragedy from her deck. There was nothing that they could have done or any of us could have done. Reporter: This community, united in grief, trying to decipher god's will. David, when you see the vehicles up close where they came to rest on the banks of the creek, frankly, it's amazing to think that anybody survived. In fact, one of the kids who did make it had just stepped out to look for help when the water hit from behind and did this. David? All right, nick watt with us again tonight.

This transcript has been automatically generated and may not be 100% accurate.

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